12538 (1998 OH)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4059016556 ± 4.35e-09
Semi-major axis (a)1.5415724184 AU ± 7.25e-10
Inclination (i)24.53563599° ± 8.41e-07
Long. of Asc. Node (Ω)220.68792372° ± 1.75e-06
Arg. of Perihelion (ω)321.78911043° ± 1.84e-06
Mean Anomaly (M)163.00612547° ± 9.55e-07
Mean Motion (n)0.5149515611°/day ± 3.63e-10
Perihelion dist (q)0.91584562 AU ± 6.72e-09
Aphelion dist (Q)2.16729922 AU ± 6.78e-09
Orbital Period1.91401747 yr ± 1.35e-09
Physical Parameters
H (abs. magnitude)15.96
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.272″
Uncertainty0
Orbit TypeApollo
MOID0.029256 AU
Observations Used10512
Radar Obs Used1
Gaia Obs Used113
Oppositions14
Arc Total1987-2025
First Observation Used1987-08-22
Last Observation Used2025-12-01
Observations (19002)
Date Type RA Dec Mag Band Observatory
2018-11-30 07:14:39 s 1 +142250.29 6 +145167.20 0.846 C57
2018-11-30 07:44:39 S 04 10 12.706 -06 37 08.69 V C57
2018-11-30 07:44:39 s 1 +142013.18 1 +147593.27 0.555 C57
2018-11-30 08:14:39 S 04 10 10.226 -06 37 52.57 V C57
2018-11-30 08:14:39 s 1 +141760.69 9 +150003.33 0.317 C57
2018-11-30 08:44:39 S 04 10 07.661 -06 38 39.30 V C57
2018-11-30 08:44:39 s 1 +141493.17 4 +152397.42 0.328 C57
2018-11-30 09:14:39 S 04 10 05.184 -06 39 23.26 V C57
2018-11-30 09:14:39 s 1 +141210.92 0 +154775.61 0.775 C57
2018-11-30 09:44:39 S 04 10 02.520 -06 40 11.35 V C57
2018-11-30 09:44:39 s 1 +140914.24 4 +157137.94 0.844 C57
2018-11-30 10:14:39 S 04 09 59.916 -06 40 56.96 V C57
2018-11-30 10:14:39 s 1 +140603.44 5 +159484.47 0.714 C57
2018-11-30 10:44:39 S 04 09 57.331 -06 41 43.01 V C57
2018-11-30 10:44:39 s 1 +140278.81 2 +161815.26 0.561 C57
2018-11-30 11:05:13 C 04 09 48.05 -06 37 44.6 U T08
2018-11-30 11:14:39 S 04 09 54.835 -06 42 28.87 V C57
2018-11-30 11:14:39 s 1 +139940.62 8 +164130.37 0.557 C57
2018-11-30 11:18:18 C 04 09 46.95 -06 38 04.1 U T08
2018-11-30 11:31:24 C 04 09 45.88 -06 38 23.8 U T08
2018-11-30 11:44:23 C 04 09 44.82 -06 38 43.2 U T08
2018-11-30 11:44:39 S 04 09 52.176 -06 43 14.66 V C57
2018-11-30 11:44:39 s 1 +139589.17 1 +166429.85 0.869 C57
2018-11-30 12:14:39 S 04 09 49.637 -06 44 00.10 V C57
2018-11-30 12:14:39 s 1 +139224.70 8 +168713.77 0.661 C57
2018-11-30 12:44:39 S 04 09 47.069 -06 44 45.96 V C57
2018-11-30 12:44:39 s 1 +138847.50 1 +170982.20 0.093 C57
2018-11-30 13:14:39 S 04 09 44.503 -06 45 32.18 V C57
2018-11-30 13:14:39 s 1 +138457.80 7 +173235.18 0.321 C57
2018-11-30 13:44:39 S 04 09 41.947 -06 46 15.02 V C57
2018-11-30 13:44:39 s 1 +138055.87 4 +175472.79 0.496 C57
2018-11-30 14:14:39 S 04 09 39.341 -06 47 02.15 V C57
2018-11-30 14:14:39 s 1 +137641.94 5 +177695.10 0.769 C57
2018-11-30 14:44:39 S 04 09 36.926 -06 47 46.72 V C57
2018-11-30 14:44:39 s 1 +137216.25 8 +179902.15 0.285 C57
2018-11-30 15:14:39 S 04 09 34.265 -06 48 33.52 V C57
2018-11-30 15:14:39 s 1 +136779.04 3 +182094.03 0.186 C57
2018-11-30 15:44:39 S 04 09 31.618 -06 49 18.98 V C57
2018-11-30 15:44:39 s 1 +136330.52 7 +184270.79 0.611 C57
2018-11-30 16:14:39 S 04 09 29.050 -06 50 03.84 V C57
2018-11-30 16:14:39 s 1 +135870.93 0 +186432.51 0.697 C57
2018-11-30 16:44:39 S 04 09 26.594 -06 50 48.88 V C57
2018-11-30 16:44:39 s 1 +135400.46 6 +188579.24 0.576 C57
2018-11-30 17:14:39 S 04 09 23.897 -06 51 34.06 V C57
2018-11-30 17:14:39 s 1 +134919.34 6 +190711.06 0.378 C57
2018-11-30 17:44:39 S 04 09 21.310 -06 52 20.78 V C57
2018-11-30 17:44:39 s 1 +134427.77 5 +192828.03 0.232 C57
2018-11-30 18:14:39 S 04 09 18.742 -06 53 06.36 V C57
2018-11-30 18:14:39 s 1 +133925.95 3 +194930.21 0.26 C57
2018-11-30 18:44:39 S 04 09 16.205 -06 53 50.21 V C57
Radar Observations (1)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2019-05-14 21:19:00 24772.1678 4 Hz 2380 -1 -1
Station codes
-1 Arecibo (305-m, 1963–2020)